Jar closure or sealing device



No. 623,326. Patented Apr. l8, I899. W P MARTIN JAR CLOSURE 0B SEALING DEVICE. (Appl t 11 11 11 May4 1898) (N0 Model.)

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Units rains nrnn'r rricnt \VILLIAM PERRY MARTIN, OF BETHELRIDGE, KENTUCKY.

JAR CLOSURE R SEALING DEVICE.

SPECIFICATION forming part of Letters Patent No. 623,326, dated April 18, 1899.

Application filed May 4, 1898. Serial No. 679,780. No model.)

To (LZZ whont it rnrty concern:

Be it known that 1, WILLIAM PERRY MAR- TIN, a citizen of the United States. residing at llethelridge, in the county of Casey and State of Kentucky, have invented a uewand useful Jar Closure or Sealing Device, of which the following is a specification.

This invention relates to fruit and otherjars and more particularly to the closures or sealing devices of such receptacles.

Myobjectistoprovideaclosure ofimproved construction capable of easy adjustment and affording a perfectly air-tight seal for the jar, which will evenly distribute the pressure on the mouth of the jar incident to its attachment thereto in such a manner that all tendency toward cracking will be reduced to a minimum, if not entirely obviated.

The present invention is of the general type of jar-closures comprising a cover to fit the mouth of the jar, a cap extending above the cover and attached to the jar-mouth, and a screw on the cap for holding the cover in closing position. Its component parts are, however, of improved construction in various respects, whereby the objects heretofore set forth are attained; and the novelty of the invention resides in the improved features and novel combinations of parts fully described hereinafter and particularly embodied in the appended claims.

In the accompanying drawings, Figure 1 is a vertical section of my improved jar and closure, and Fig. 2 a detail plan vi'ew of the cap.

The jar 1, to which my improved closure is applied, is of the same construction as an ordinary fruit-jar with the exception of its month, which is enlarged or thickened onits interior into the bead 2, having its upper face inclined, as shown at 3. The thickening at this point is for the purpose of givinggreater strength at the part where the pressure is greatest. The usual screw-threads a are provided on the exterior of the neck, which is here curved slightly to more perfectly conform to the shape of the cap.

The cover 5 is of dish or dome shape and preferably of glass or porcelain of suitable thickness to stand considerable pressure. Its lower annular edge is beveled to correspond to the bevel on the jar which it is designed sufficiently to properly seal the jar.

to lit, a rubber gasket 6 being interposed between the two surfaces to insure a perfect and air-tight joint. A small undercut cavity is provided in the upper outer portion of the cavity, which is filled with Babbitt metal 7 as a bearing for the tip of the clamping-screw on the cap.

The cap 8, which is of dome shape, maybe constructed out of any suitable metal having the necessary strength and a proper degree of resiliency, so that it will give without wrinkling or bending when under pressure. Its lower portion is provided with interior screw-threads 8, designed to engage those on the jar. The cap is provided with a number of evenly-spaced integral ribs 9 on its exte' rior, which begin at the apex 10where the cap is thickened and extend radially down to about the line of the screw-threads. These ribs are arched and taper at their ends 11 and are highest (considered outwardly from the face of the cap) at points intermediate said ends, thus givinga construction which is both light and strong. Besides being of practical value and constituting a valuable part of the invention they give it a symmetrical and pleasing appearance. The tightening or clamping screw 12 has a ring for the fingers of the operator, and its shank is threaded through the part 10 in position for its tip to bear on the metal filling 7.

In sealing the jar the gasket is first applied to the beveled mouth and the cover then fitted onto the gasket. The cap is then screwed on the jar over the cover and the clampingscrew turned until the cover is pressed down \Vhen the screw is turned and the cover pressed against the jar-mouth, the pressure transmitted through the cover to the jar approximates a lateral direction, and were the cap not employed there would be a tendency toward expansion and breakage of the jar-neck if the screw were turned too tight. active pressure through the cap, together with the thickening of the jar-mouth, neutralizes this tendency, however. When the screw is turned, the upper portion of the cap is urged away from the cover to: a certain extent, as the reactive pressure on the cap will of course equal the active pressure on the cover. [This reactive pressure being transmitted through The rethe cap equally in all directions from the apex is applied to the outer face of the jarneck where the cap is screwed on, and acting in opposition to the pressure through the cover practically neutralizes it,'and thus prevents expanding and breakage of the jarneck, so that the cover can be clamped down very tight to insure a perfect seal. The utility of the ribs on the cap'is therefore appar ent. They make possible the employment of a cap, which while light and suificiently springy is sufficiently strong. The thickening or beading of the mouth of the jar also afifords a broad bearing-surface for the cover, thus giving a better joint.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is

' 1. The combination with a jar, of a cover therefor, a cap having connecting means whereby it can be fastened to the jar, said cap housing the cover, a plurality of strengthening-ribs on the cap which radiate from its apex or top and extend down its sides, and a clamping-screw adapted for exerting direct pressure on the cover and reactive pressure on the cap.

2. The combination with a jar having exterior screw-threads, of an arched cover for the jar, a dome-shaped metallic cap, housing the cover, which has screw-threads adapted to engage those on the jar and is provided with exterior, raised strengthening-ribs extending from its apex down its sides, and a clamping-screw passing through the apex of the cap and adapted to hold the cover on the jar.

3. Thecombination withajarhavingaflared or beveled mouth, and exterior screw-threads, of an arched cover having a beveled lower edge adapted to fit the mouth, and provided with a hearing or seat in its apex, a gasket between the edge of the cover and mouth, a metallic, dome-shaped cap housing the cover which is provided with internal screw-threads adapted to engage those on the jar and having exterior, raised, strengthening-ribs extending from its apex downward, and a clamping-screw threaded through the apex of the cap with its tip in position to abut the bearing or seat of the cover.

4. The herein-described dome-shaped cap having arched strengthening-ribs extending from its apex downwardly, said ribs tapering at their ends and being highest at their central points.

WILLIAM PERRY MARTIN. \Vitnesses:

JAMES THOMAS WATSON, WILLIAM KING PHELPs. 

